My own anecdotal experience is that in America, very few homes have hoods that vent to outside the building. I have lived in one LEED certified apartment buildi

My own anecdotal experience is that in America, very few homes have hoods that vent to outside the building. I have lived in one LEED certified apartment building that had one, and even that had issues with the exhaust backing up because they needed to clean the exterior grille (it vented next to the dryer vent). In single family homes I have generally seen them in high end subdivisions or custom builds. I believe the code in some areas is getting stricter and they are starting to become more common, but they seem rare in existing housing stock. I see a lot of recirculating range hoods, but they do nothing for combustion products. They only trap some of the aerosolized grease from frying and sautéing.